691142167 has 2 divisors, whose sum is σ = 691142168. Its totient is φ = 691142166.

The previous prime is 691142159. The next prime is 691142189. The reversal of 691142167 is 761241196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691142167 - 2³ = 691142159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691142147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345571083 + 345571084.

It is an arithmetic number, because the mean of its divisors is an integer number (345571084).

Almost surely, 2^691142167 is an apocalyptic number.

691142167 is a deficient number, since it is larger than the sum of its proper divisors (1).

691142167 is an equidigital number, since it uses as much as digits as its factorization.

691142167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 691142167 is about 26289.5828608976. The cubic root of 691142167 is about 884.1428994265.

The spelling of 691142167 in words is "six hundred ninety-one million, one hundred forty-two thousand, one hundred sixty-seven".